What It Does: The engineers had fun with Facebook's language settings. This pic shows what happens when you set your language to "English (upside down)," but you can also try out "English (Pirate)" which (among other things) will arrange your timeline by "shots o' rum" and "turns o' yer hourglass."

What It Does:This one started with users noticing that if they typed @[4:0] into a comment or wall post, it would change it to "Mark Zuckerberg." As it turns out, that's Facebook's way of calling usernames, and it works for any number. (Zuckerberg came on as user #4, after three test profiles.)

If you want to find the number that calls out your own name, just go to your profile page and, in the url, replace "www" with "graph." You should end up with something that looks like this, with the number on the second line.

What It Does:A couple people were poking around on Facebook's photo server when they noticed that if you went to the URL for the main photo folder (maybe hoping to see photos you didn't otherwise have access to), you'd get a picture of this infantilized Celtics fan as the index file. No one was ever able to figure out why.

5.The Chat Thumbnail

What It Does: If you put a username between double brackets in Facebook chat (like so: [[russell.brandom]]), it will magically transform into that person's thumbnail pic. It hasn't evolved into an emoji-substitute quite yet, but we've got high hopes.

What It Does:On the first few redesigns, if you scrolled to the bottom of nearly any page, you'd find either a cryptic reference to quails or a line from Top Gun in fine print — just what you'd expect from a nerdy 20-year-old.

Current Status: These were part of what defined Facebook as a college thing — so not surprisingly, they didn't live to see 2009.

7.The Konami Code

What It Does: This one goes back to the most famous easter egg of all, the Konami Code. On early incarnations of Facebook, those fateful ten keystrokes would call up a lens flare effect that moved around as you scrolled.

Current Status: Sadly, this one went out with the tabbed browser page in 2009.